Mishkat al-Masabih
Mishkat al-Masabih 44
Arabic hadith text
وَعَنْ أَبِي هُرَيْرَةَ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: إِذَا أَحْسَنَ أَحَدُكُمْ إِسْلَامَهُ فَكُلُّ حَسَنَةٍ يَعْمَلُهَا تُكْتَبُ لَهُ بِعشر أَمْثَالهَا إِلَى سبع مائَة ضعف وكل سَيِّئَة يعملها تكْتب لَهُ بِمِثْلِهَا "
Translation
Abu Hurayra reported that the Messenger of God said: “When one of you practices Islam well, every good deed he does is recorded for him as ten like it, up to seven hundred times; and every bad deed he does is recorded for him as one like it.”